linux-kernel - Re: [PATCH v6 00/12] HWPOISON: soft offline rework

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Message-Id: <6214D3DD-7EB1-4598-8DA2-344430EC7858@lca.pw>
Date:   Mon, 10 Aug 2020 23:45:36 -0400
From:   Qian Cai <cai@....pw>
To:     =?utf-8?Q?
         "HORIGUCHI_NAOYA=28=E5=A0=80=E5=8F=A3=E3=80=80=E7=9B=B4?=
        =?utf-8?Q?=E4=B9=9F=29" ?= <naoya.horiguchi@....com>
Cc:     "nao.horiguchi@...il.com" <nao.horiguchi@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mike.kravetz@...cle.com" <mike.kravetz@...cle.com>,
        "osalvador@...e.de" <osalvador@...e.de>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "david@...hat.com" <david@...hat.com>,
        "aneesh.kumar@...ux.vnet.ibm.com" <aneesh.kumar@...ux.vnet.ibm.com>,
        "zeil@...dex-team.ru" <zeil@...dex-team.ru>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>
Subject: Re: [PATCH v6 00/12] HWPOISON: soft offline rework



> On Aug 10, 2020, at 11:11 PM, HORIGUCHI NAOYA(堀口　直也) <naoya.horiguchi@....com> wrote:
> 
> I'm still not sure why the test succeeded by reverting these because
> current mainline kernel provides similar mechanism to prevent reuse of
> soft offlined page. So this success seems to me something suspicious.

Even if we call munmap() on the range, it still can’t be be reused? If so, how to recover those memory then?

> 
> To investigate more, I want to have additional info about the page states
> of the relevant pages after soft offlining.  Could you collect it by the
> following steps?

Do you want to collect those from the failed or succeed kernel?